Sale of consumer goods isn't governed by contract law ahead of the Sale of Goods Act. Contract law would be relevant if there were a written contract drawn up beforehand.
It's also inaccurate to believe that the retailer offers goods for sale. In business to consumer transactions, it's the other way around.
Technically, the consumer makes an offer to purchase. Once the retailer accepts that offer, they have no further control over the goods, which are legally yours to do with whatever you wish.
Your view of the dealer making the offer is only the case when the transaction is business to business (like when the grey market dealer buys from the AD).
Edit: I was talking nonsense.
Last edited by learningtofly; 12th August 2017 at 20:47.